Mini Base Board For Compute Module 4 (B)

This Mini Base Board (B) for the Raspberry Pi Compute Module 4 is a compact CM4 breakout option offering a good set of features with a small footprint.

Two versions of this board are available - Lite (A) or Full (B). This is the Full (B) version which comes with the additional Real-time Clock (RTC) and fan speed control.

With its M.2 slot, MicroSD card slot, Real-Time Clock, dual-CSI ports and a host of other features, it's a great base for any CM4 project you're planning.

Note: Compute Module, M.2 SSD and RTC battery not included

Features

•  * The CM4 Mini base board offers the following connectivity options and features:
•  * 40-pin Raspberry Pi GPIO header
•  * 1x RJ45 Gigabit Ethernet
•  * 2x USB 2.0 ports
•  * 1x Full-size HDMI port
•  * 1x M.2 slot (Supports NVME SSD or communication modules with PCI-E M.2 KEY-M interface)
•  * 1x MicroSD slot
•  * 1x Real-Time Clock (RTC) (battery not included)
•  * 2x CSI Camera ports
•  * 1x DSI Display port
•  * 1x USB 2.0 FFC Connector
•  * 1x HDMI FFC Connector
•  * 1x 4-pin fan header
•  * USB-C programming/power port

Specification

POE	N/A
USB	USB 2.0 × 2
	USB 2.0 × 2 (via FFC connector)
GPIO	Raspberry Pi 40PIN GPIO × 1
HEADER	M.2 slot × 1
HDMI	HDMI × 2
	(1x via FFC connector)
	Supports 4K 30fps output
DSI DISPLAY	MIPI DSI × 1
	(15pin 1.0mm FPC)
CSI CAMERA	MIPI CSI-2 × 2
	(15pin 1.0mm FPC)
POWER INPUT	5V
FAN	5V
	Allows speed adjustment and measurement
RTC	Real-time clock with battery socket and ability to wake Compute Module 4
RJ45 ETHERNET	Gigabit Ethernet
CM4 SOCKET	Suitable for all variants of Compute Module 4
SD CARD SLOT	MicroSD card socket for Compute Module 4 Lite (without eMMC) variants
DIMENSIONS (MM)	85.0 × 56.0

What's Onboard ?

1) CM4 socket

- Suitable for all variants of Compute Module 4

2) Power input/Programming

- 5V/2.5A power supply, or used for eMMC burning

3) DISP

- MIPI DSI display port

4) Fan

- For connecting cooling fan, allows speed adjustment and measurement

5) Camera

- 2x MIPI CSI camera ports

6) HDMI0 connector

- HDMI0 port, supports 4K 30fps output

7) USB 2.0 ports

- 2x USB 2.0 ports, for connecting USB devices

8) Gigabit Ethernet connector

- Gigabit Ethernet RJ45 connector, with 10 / 100 / 1000M network support

9) M.2 indicator

- Indicating the operating status of M.2 interface

10) ACT indicator

- Indicating the operating status of Raspberry Pi

11) PWR indicator

- Indicating the status of Raspberry Pi power supply

12) BOOT selection

- ON: CM4 would be booted from USB-C interface

- OFF: CM4 would be booted from eMMC or Micro SD card

13) 40-pin GPIO header

14) Micro SD card slot

- For connecting a Micro SD card with pre-burnt image (Lite variant ONLY)

15) HDMI1 FFC connector

- HDMI1 port, supports 4K 30fps output

16) USB 2.0 FFC connector

- Can be connected through an adapter

17) FE1.1S

- USB HUB chip, expanding one USB port to 4x ports

18) M.2 slot

- Supports NVME SSD, or communication modules with PCI-E M.2 KEY-M interface

19) RTC chip

- Allows RTC-related functions like wakeup, shutdown, reboot, and more

20) RTC interrupt selection

- PI-RUN: CM4 reboot on RTC interruption

- GN-EN: CM4 shutdown on RTC interruption

- D4: D4 pin is triggered on RTC interruption

21) EMC2301

- Fan controller, for speed adjustment/measurement

22) RTC battery holder

- Supports CR1220 button cell

Resources

Product Wiki

Package Contents

1x CM4 Mini Base Board (B)

1x SSD Mounting Screw

Compute Module, M.2 SSD and RTC battery not included